5
TABLE OF CONTENTS
HCD-GX750/RG551/RX550
1. SERVICE NOTE
1-1. Service Position-1 (AMP Board) ........................................ 6
1-2. Service Position-2 (BD81A Board) .................................... 6
2. GENERAL
Main Unit ................................................................................ 7
Remote Control ....................................................................... 8
3. DISASSEMBLY
3-1. Case (Top) ......................................................................... 10
3-2. CD Door ............................................................................ 10
3-3. Front Panel Section ........................................................... 11
3-4. CD Mechanism Deck ........................................................ 11
3-5. Tape Mechanism Deck, Game Jack Board ........................ 12
3-6. Panel Board ....................................................................... 12
3-7. Back Panel Section, Sub Trans Board ............................... 13
3-8. Trans Board ....................................................................... 13
3-9. Main Board ....................................................................... 14
3-10. Sub Woofer Board ............................................................. 14
3-11. Amp Board ........................................................................ 15
3-12. BD81A Board ................................................................... 15
3-13. Connect Board ................................................................... 16
3-14. Driver Board, SW Board ................................................... 16
3-15. Optical Pick-up ................................................................. 17
3-16. Sensor Board ..................................................................... 17
3-17. Motor (TB) Board ............................................................. 18
3-18. Motor (LD) Board ............................................................. 18
4. TEST MODE
..................................................................... 19
5. DIAGRAMS
5-1. IC Pin Descriptions ........................................................... 22
5-2. Block Diagram –CD Section– ........................................... 27
5-3. Block Diagram –Main Section– ........................................ 28
5-4. Block Diagram –Panel/Power Section– ............................ 29
5-5. Block Diagram –Sub Woofer Section– ............................. 30
5-6. Circuit Boards Location .................................................... 30
5-7. Note for Printed Wiring Boards
and Schematic Diagrams .................................................. 31
5-8. Waveforms ......................................................................... 31
5-9. Printed Wiring Board –CD Mechanism Section (1/2)– .... 32
5-10. Schematic Diagram –CD Mechanism Section (1/2)– ....... 33
5-11. Printed Wiring Boards –CD Mechanism Section (2/2)– ... 34
5-12. Schematic Diagram –CD Mechanism Section (2/2)– ....... 35
5-13. Schematic Diagram –Main Section (1/2)– ........................ 36
5-14. Schematic Diagram –Main Section (2/2)– ........................ 37
5-15. Printed Wiring Board –Main Section– .............................. 38
5-16. Printed Wiring Boards –Panel Section– ............................ 39
5-17. Schematic Diagram –Panel Section (1/2)– ....................... 40
5-18. Schematic Diagram –Panel Section (2/2)– ....................... 41
5-19. Printed Wiring Boards –Jack Section– .............................. 42
5-20. Schematic Diagram –Jack Section– .................................. 43
5-21. Printed Wiring Board –Sub Woofer Section– ................... 44
5-22. Schematic Diagram –Sub Woofer Section– ...................... 45
5-23. Printed Wiring Board
–Power Amp Section (GX750/RX550)– ........................... 46
5-24. Printed Wiring Boards
–Transformer Section (GX750/RX550)– .......................... 47
5-25. Schematic Diagram –Power Section (GX750/RX550)– ... 48
5-26. Printed Wiring Board –Power Amp Section (RG551)– .... 49
5-27. Printed Wiring Boards –Transformer Section (RG551)– .. 50
5-28. Schematic Diagram –Power Section (RG551)– ................ 51
5-29. IC Block Diagrams ............................................................ 52
6. EXPLODED VIEWS
6-1. Main Section ..................................................................... 54
6-2. Front Panel Section (1) ...................................................... 55
6-3. Front Panel Section (2) ...................................................... 56
6-4. Front Panel Section (3) ...................................................... 57
6-5. Main Board Section .......................................................... 58
6-6. CD Mechanism Section (1) ............................................... 59
6-7. CD Mechanism Section (2) ............................................... 60
7. ELECTRICAL PARTS LIST
........................................ 61
